Effect of Unbound Granular Materials Nonlinear Resilient Behavior on Pavement Response and Performance of Low Volume Roads

Authors: K. Sandjak, B. Tiliouine

Abstract:

Structural analysis of flexible pavements has been and still is currently performed using multi-layer elastic theory. However, for thinly surfaced pavements subjected to low to medium volumes of traffics, the importance of non-linear stress-strain behavior of unbound granular materials (UGM) requires the use of more sophisticated numerical models for structural design and performance of such pavements. In the present work, nonlinear unbound aggregates constitutive model is implemented within an axisymmetric finite element code developed to simulate the nonlinear behavior of pavement structures including two local aggregates of different mineralogical nature, typically used in Algerian pavements. The performance of the mechanical model is examined about its capability of representing adequately, under various conditions, the granular material non-linearity in pavement analysis. In addition, deflection data collected by Falling Weight Deflectometer (FWD) are incorporated into the analysis in order to assess the sensitivity of critical pavement design criteria and pavement design life to the constitutive model. Finally, conclusions of engineering significance are formulated. 

Keywords: Nonlinear resilient behavior, unbound granular materials, RLT test results, FWD backcalculations, finite element simulations, pavement response and performance.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1109145

References:

[1] CTTP-Direction des Routes, Ministère des Travaux Publics, Catalogue de Dimensionnement des Chaussées, 2001, Algeria.
[2] Huang, Y. H., Pavement Design and Analysis. Prentice Hall, Englewood Cliffs, USA, 2004.
[3] COST 337, Unbound granular materials for road pavements, Final report. EC, Directorate General for Research and Technological Development, 2002, Belgium.
[4] Jouve, P., Elhannani, M., Application des modèles non-lineaires au calcul des chaussées souples, Bull. Liaison. Labo. P. et Ch., 1994, N°. 190, Paris, France.
[5] Paute, P.L, Hornych, P., Benaben, J.P, Comportement mécanique des graves non-traitées, Bull. Liaison. Labo. P. et Ch., 1994, N°. 190, Paris, France.
[6] Gonzalez, A., Saleh, M. F, Ali, A., Evaluating Nonlinear Elastic Models for Unbound Granular Materials in Accelerated Testing Facility, Transportation Research Record, 2007, N°. 1990, pp. 141-149.
[7] Sandjak, K., Tiliouine, B., Experimental evaluation of non-linear resilient deformations of some Algerian aggregates under cyclic loading, Arabian Journal for Science and Engineering, 2013, DOI: 10.1007/s13369-013-0737-4.
[8] NCHRP, Guide for Mechanistic-Empirical Design of New and Rehabilitated Pavement Structures, Part2. Design Inputs. NCHRP Final Report, 2004.
[9] Ekblad, J., Statistical evaluation of resilient models characterizing coarse granular materials, Mater Struct, 2008, N°. 41, pp. 509-525, DOI: 10.1617/s11527-007-9262-9.
[10] Umesh, C.S. and Kusam S.R., Effect of nonlinearity in granular layer on critical pavement responses of low volume roads, Int. J. Pavement Res. Technol, vol.3, 2010, N°. 6, pp. 320-325.
[11] Uzan, J., Characterization of granular materials, Trans. Res. Rec. 1022, Transportation Research Board, (1985), 52-59.
[12] Tiliouine, B., Sandjak, K., Numerical simulation of granular materials behaviour for unbound base layers used in Algerian flexible pavement structures, Int. Journal of civil and structural engineering, Vol. 4, No. 3, 2014, doi:10.6088/ijcser.201304010040.
[13] Azzouni, A., Simulation numerique des bassins de deflexion issus du système FWD, Thèse de Magister ENSTP, 2010, Alger, Algérie.
[14] Ji, R., Siddiki, N., Nantung, T., Kim, D., Evaluation of resilient Modulus of subgrade and base materials in Indiana and its implementation in MEPDG, The scientific World Journal, Vol. 2014, Article ID 372838, http://dx.doi.org/10.1155/2014/372838
[15] AASHTO: Mechanistic–Empirical Pavement Design Guide: a Manual of Practice. American Association of State and Highway Transportation Officials, Washington DC, ISBN Number: 1-56051-423-7, 2008, 212 p.
[16] Almassy, K., Examination of mechanical properties in unbound road bases, Periodica Polytechnica Civil Engineering, 46/1,(2002), 53-69.
[17] Rondon, H.A., Wichtman, T., Triantafyllidis, Th. and Lizcano, A., Comparison of cyclic triaxial behavior of unbound granular material under constant and variable confining pressure. Journal of Transportation Engineering, ASCE, Vol. 135, No. 7, 2009, 467-478.
[18] Lekarp, F., Dawson, A., State of the Art I: Resilient Response of Unbound Aggregates. Journal of Transportation Engineering, ASCE, Vol. 126, No. 1, 2000, pp. 66-75.
[19] Witczak, M.W. and J. Uzan, The Universal Airport Pavement Design System, Report I of IV:Granular Material Characterization. University of Maryland, College Park, MD, 1988.
[20] Tiliouine, B., Sandjak, K., Non-linear finite element modelling of unbound granular materials in flexible pavement analysis, Euro. Conf. Compt. Mechanics, 2001, Crakow, Poland.
[21] Zienkiewicz, O.C., Taylor, R.L., The finite element method, Oxford, 6th edition, 2005.
[22] Bocz, P., The effect of stiffness and duration parameters to the service life of the pavement structure, Periodica Polytechnica Civil Engineering, 53/1,(2009), 53-69, doi: 10.331/pp.ci.2009-1.05.
[23] Sadrnejad, S.A, Ghanizadeh, A.R, Fakhri, M., Evaluation of the three constitutive models to characterize granular base for pavement analysis using finite element method, Australian Journal of Basic and Applied Sciences, 5/1, (2011), 778-786.
[24] Ekwulo, E.O and Eme, D.B, Fatigue and rutting strain analysis of flexible pavements designed using CBR methods, African Journal of Environmental Science and Technology, Vol. 3, 2009, pp. 412-421.
[25] Murana, A., Olowosulu, T., Distress model for Nigerian Empirical Pavement analysis and design system, 4th Int. Conf. on Emerging Trends In Engineering and Technology, 25th -27th October, 2013.